Holding(s) in Company

Diploma PLC
12 December 2003


Letter to Diploma plc
Dated 12 December 2003

DIPLOMA PLC (THE 'COMPANY') - SEDOL 0182663

This notification supersedes our previous notification to you dated 24 September
2003 and is prompted by purchases totalling 5,000 on 11 December 2003.

This notification relates to issued ordinary shares of GBP0.05 each in the
capital of the Company (the 'shares') and is given in fulfilment of the
obligations imposed by sections 198 to 202 of the Companies Act 1985 (the
'Act').

1.  Notification on behalf of Morley Fund Management Limited (a subsidiary of 
    Aviva plc).

1.1 We hereby notify you on behalf of Morley Fund Management Limited that 
    immediately after the time when the obligation to make this notification 
    arose Morley Fund Management Limited were interested in 1,359,408 shares.

1.2 The identity of the registered holders of the shares to which this 
    notification relates and the number of shares held by each of them are set 
    out below in the Appendix: Morley Fund Management Limited.

2.  Notification on behalf of Aviva plc.

2.1 We hereby notify you on behalf of Aviva plc that immediately after the time 
    when the obligation to make this notification arose Aviva plc were 
    interested in 1,359,408 shares giving the Aviva group a total percentage 
    interest in the shares of 6.00%.

2.2 The identity of the registered holders of the shares to which this 
    notification relates and the number of shares held by each of them are set 
    out below in the Appendix: Aviva plc.

If you require further information as to which companies in the Aviva group hold
interests in the shares (by virtue of s.203 of the Act) please submit a written
request and we will be happy to supply this information.

We are only required to notify interests which are defined as material interests
when the holding is equal to 3% or more of the Company's relevant share capital.
The term material interests exclude certain categories where we do not hold a
beneficial interest, for example where the shares are held in an Authorised Unit
Trust Scheme or Open Ended Investment Company. Holdings in those categories are
therefore not included in the holding notified under this letter. If you wish us
to confirm the level of holdings in these categories, please let us know.

Letter from Aviva plc


APPENDIX: MORLEY FUND MANAGEMENT LIMITED

REGISTERED HOLDERS                                        NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd                                105,871 (Material)

Chase GA Group Nominees Ltd                                   937,845 (Material)

Chase Nominees Ltd                                             26,076 (Material)

CUIM Nominee Ltd                                              212,587 (Material)

RBSTB Nominees Ltd                                             77,029 (Material)


TOTAL PERCENTAGE INTEREST OF MORLEY FUND MANAGEMENT LIMITED:               6.00% 

ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED:             22,647,911


APPENDIX: AVIVA PLC 

REGISTERED HOLDERS                                        NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd                                105,871 (Material)

Chase GA Group Nominees Ltd                                   937,845 (Material)

Chase Nominees Ltd                                             26,076 (Material)

CUIM Nominee Ltd                                              212,587 (Material)

RBSTB Nominees Ltd                                             77,029 (Material)


TOTAL PERCENTAGE INTEREST OF AVIVA PLC:                                    6.00% 

ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED:             22,647,911



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